“Father is pretty tired, I suppose,” reflected the youth, “but, all the same, I am going to get mother to urge him up to some action on that patent business. Delays are dangerous, and I haven’t much confidence in Mr. Saxton.”

Bob Dallow greeted them as they reached home. Mr. Hardy went into the house, where his wife had a special lunch spread for him.

“Well, Bob, what about the whistle?” inquired Ben.

“Going fine,” declared Bob. “We made a big mistake, though.”

“How is that?”

“Sold it too cheap. That Vladimir seems to be coining money out of it.”

“Well, I am satisfied,” said Ben.

The conversation drifted to airships before the two boys had been together five minutes. The enthusiastic Bob declared that he was going to make a big record in the new field he was about to enter so ardently. He predicted that if Ben would study up aeronautics and put his inventive ability to work, he would make a grand success.

“You overrate me,” said Ben modestly. “At all events, though, I would like to go to the aero meet next week.”

“We’ll have one fine time, if you do,” returned Bob. “I’ll write you as soon as I get fixed in my new position. In the meantime, let us bring up the subject to your father and see what he thinks about it.”